Quote:
Originally Posted by Dknits782
besides losing boost is it safe on my car (05 sti) to run without cat and muffler
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Boost cut is not a "loss of boost", it's "so much boost, the engine is trying to save itself by cutting the fuel".
Unless you've ported the wastegate on the turbo to allow the stock map to properly regulate the boost, you may have potentially engine-destroying problems with catless exhausts.